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Pressure seems high?

AlwaysLearning2024
AlwaysLearning2024 Member Posts: 29
in THE MAIN WALL

Hi everyone,

1990’s W-M hydronic boiler. Fired up for the cold season and have noticed that the pressure seems high. There is a tick mark on the gauge for roughly 12psi, yet once the water is hot, the pressure rises to about 25psi. I understand the pressure would increase with water temperature yet is the 12PSI the system pressure before heating? Should I relief some of the presssure?


Thanks for any help!

Comments

  • 109A_5
    109A_5 Member Posts: 1,472

    Hello AlwaysLearning2024,

    I would inspect the expansion tank (tap test), the air side of the diaphragm may be flooded due to a leaky

    diaphragm.

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System

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